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# How do I calculate my duration when I change from non drop frame to drop frame

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 How do I calculate my duration when I change from non drop frame to drop frame on May 20, 2017 at 4:35:10 am

I'm about to start an edit for a show and the network specs say that the lock time must be 42 minutes flat and delivered in a 1080i 59.94 format for broadcast. I'm getting confused by the rhetoric of switching between DF, NDF and reading in different places that 1080p 29.97 equates to 1080i 59.94.

We're shooting and editing at 23.98 and I'm currently doing tests to calculate what a lock time at 42 minutes flat in 1080i 59.94 would equate to in a 1080p 23.98 timecode. I want to make sure that we are locking at the correct time in the edit, and that we're not over or under time when we convert (3:2 pulldown?) for delivery. Can anyone shed some light on how to calculate what the network specs translate to in a 23.98 TC? Or know any good TC calculators?

Thanks so much!

 Re: How do I calculate my duration when I change from non drop frame to drop frameon May 20, 2017 at 7:55:02 am

You don't need ANY of that. This is very simple. Just change the timecode display in the source side to display 30DF code.

Click on the top timecode, choose SEQUENCE>Timecode>30DF

Done

Bonus picture of my wife playing banjo...

Shane
Little Frog Post
Read my blog, Little Frog in High Def

 Re: How do I calculate my duration when I change from non drop frame to drop frameon May 20, 2017 at 12:20:46 pm

One small gotcha:
Remember that you start on frame ZERO
So, your last frame should show TC 00:41:59;29 (Instead of 00:42:00;00)

Bouke
http://www.videotoolshed.com

 Re: How do I calculate my duration when I change from non drop frame to drop frameon Jul 21, 2017 at 6:28:21 amLast Edited By Brent Marginet on Jul 21, 2017 at 6:49:22 am

Here's a handy free TC Calc that will do the job.

Set the Frame Rate to 29.97DF then type in the show length.
Since there is no 42;00;00 in DF T/C type in 42;00;02.
Now change it to Frames (75526), multiply by 24 and then divide by 30.
Now change the Frame rate to 23.98 and the show length at 23.976 is 41:57:12.

"MY MEDIA/PROJECT MOTO: If you think three copies of your media or project are enough.
Take a moment to place a value on them and then maybe add two more.
Hard Drives are now stupidly cheap. A RE-SHOOT AND YOUR TIME AREN'T."